Dr. Kat Flewelling, a naturopathic physician in private practice in Seaside, will present “The Magic of Magnesium – for Headaches, Muscles and More” at the free monthly Astoria Co-op Wellness Class at 4 p.m. Tuesday, April 4. The Astoria Co-op is located at 1389 Duane St. in downtown Astoria. The public is welcome to attend. There will be a question and answer session after the presentation.